Similar Species
Other plants with white flowers in large compound umbels may be confused with Achillea millefolium; these include water parsnip, (swamp parsnip, sium suave) and western water hemlock, (Cicuta douglasii, poison hemlock) and spotted water hemlock (Cicuta maculata, spotted parsley, spotted cowbane). Water parsnip and water hemlock have clusters of small white flowers that are shaped like umbrellas, and both grow in moist soils. Water parsnip leaves are once compound, and water hemlock leaves are three times compound. Water hemlock has a large swelling at the stem base. All parts of water hemlock are highly poisonous. Other yarrow species have similar foliage and flowers, including: Achillea ageratifolia and Achillea nobilis.
Read more about this topic: Achillea Millefolium
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